First class and Troublous

First class noun - Mail that includes letters and postcards and packages sealed against inspection.

Troublous and first class are semantically related. In some cases you can use "Troublous" instead an adjective phrase "First class".

Troublous adjective - Causing worry or anxiety.

First class and troublous are semantically related. Sometimes you can use "First class" instead an adjective "Troublous".

Nearby Words: trouble, troubled, troubling